Tool joint pin



Aug. 6, 1940. s. A. LINNEY TOOL JOINT PIN Filed Jan. 25, 1959 InventorPatented Aug. 6, 1940 4 UNITED STATES I 2,210,815 TOOL JOINT PIN ScottyAlton Unney, Refugio, Texi Application January 23,

3 Claims.

invention relates generally to tool joint structure for use in drillpipe employed in drilling o l and gas wells, and particularly to a tooljoint pin having release mechanism whereby the tool to which the jointis connected may be easily pulled out of the drill pipe, and animportant object of my invention is to provide arrangements of thecharacter indicated above which are adapted to be used on each joint ofthe drill pipe.

Other important objects and advantages of my invention will be apparentfrom a reading of the following description taken in connection with thedrawing, wherein for purposes illustration I have shown a preferredembodiment of my invention.

In the drawing:

Figure l is a general transverse vertical sec-- tionai view takenthrough'the embodiment and showing the sleeve seated in circulation holeclosing position.

Figure 2 is an enlarged sectional elevational view of the dog mechanism.

Figure 3 is an elevational view of Figure 2 taken at right anglesthereto.

Figure 4 is a horizontal sectional view taken through Figure 1approximately on the line 4-4 and looking downwardly in the direction ofthe arrow.

Referring in detail to the drawing, the numeral 5 generally designatesthe body of the joint which has an internal threaded flange 6 at itsupper end in which the drill pipe 1 is threaded. AYflat helical spring 8occupies the space between the shoulder 9 defined by the flange 6 andthe shoulder ill defined by a reduced bore portion II. The reducedportion 1 I isv smooth so as to provide, a comparatively frictionlessbearing surface for the sleeve I! which is to be worked up and down inthe bore portion ii in conjunction with the spring 8 which engages thetop of the sleeve l2 so as to normally urge the same to a depressedposition in which the beveled lower end I! of the sleeve seats on thebeveled shoulder i4 which joins the lower end of the reduced boreportion l I, all as clearly shown in Figure 1 of the drawing. Below theshoulder l4 the body of the joint has areduced bore is which is axiallyaligned with and substantially of the same diameter as the bore IS inthe sleeve l2. Adjacent the upper part of the bore in the sleeve .1 2 isa radially outwardly beveled annular notch H which accommodates thereleasing dogs l8, l9, respectively, which are pivoted coaxially atopposite sides of the release rod 20 which has an enlarged diameterportion 2i below the pivotal point 22, which enlarged 1939, Serial No.252,498

diameter portion normally depends through the sleeve l2 into the reducedbore portion I! of the tool body and has a pointed lower end 23.Respective links 24, 25 are pivoted at their lower ends to therespective-dogs l8, is, as indicated in 5 Figure 2 of the drawing, atthe points designated 2, 21, and the upper ends of these links arepivoted on opposite sides of a collar 29 slidably arranged on the rod 20above the dogs and within the lower end of the tube 28 which extends up10 through the drill pipe I as indicated in Figure l of the drawing soas to be capable of being raised and lowered selectively. When the tube28 is lowered from the position shown in Figure 2 this engages the links24 and 25 so as to bring the 16 does It, ll toward each other and out ofengagement with the annular notch il in the sleeve l2,

in which condition the releasing dog assembly may be withdrawn throughthe drill pipe, or passed down therethrough to occupy a position 20 inthe joint I, as the case may be. With the dog assembly pushed down belowthe annular groove II, the dogs I, it may be caused to spread by gravityor the action of the fluid in the drill pipe sufficiently to bearagainst the beveled face of the groove I! to reach the positionillustrated in Figure 1 of the drawing and thereby provide for elevatingthe sleeve i2 by pulling up on the tube 28,

to a position in which the circulation holes III arranged through thewall of the body 5 above the shoulder l4 are uncovered and circulatewater through the joint to release the joint in the event that the samebecame stuck. The lower end of the joint body 5 is provided with anexternally v threaded tapered point 3! for connection with the tool (notshown).

Although I have shown and described herein a preferred embodiment of myinvention, it is to be definitely understood that I do not desire tolimit the application of the invention thereto, and any change orchanges may be made in the structure and arrangement of the parts,within the spirit of the invention and the scope or the subjoinedclaims.

Having described the invention, what is claimed as new is:

l. A tool joint comprising a tubular body having a stop shoulder withinthe lower part thereof and below circulation holes formed through thewall of said body, an imperforate sleeve slidable so in said bodybetween a position above and exposing said holes to a position in whichthe lower end of the sleeve engages said stop shoulder and closes saidholes, spring means compressed between an upper part of said tubularbody .and the top of said sleeve and normally holding said sleeve 3. Ina device of the class described, a vertically on said stop shoulder, andmeans freely insertible ed tubu a member having a transverse through theupper end of said body and through port therein and a valve seat belowthe port, a said sleeve, said means comprising a carrier insleeveslidably arranged in the tubular member, cluding a rod, upwardlyextending arm's pivoted spring means for normally holding the sleeve on5 at their lower ends on said rod, links connected the seat and closingthe port, said sleeve having to and between the rod and the arms, and anopan internal groove therein forming a downwardly erator on the rod andengageable with said links facing shoulder, a rod adapted to be passedfor contracting the arms to pass freely through through the tubularmember into the sleeve, arms the body and the sleeve, said operatorbeing operpivoted at the lower ends to said rod and having 10 able topermit said arms to spread within said their upper ends adapted toengage the shoulder sleeve, said sleeve having an internal lift shoulderfor raising the sleeve when the rod is pulled upengageable by said armsin their spread condiwardly, links pivoted to intermediate portions oftion upon elevation of said rod to lift said sleeve the arms andextending upwardly, means for slida in t he r sistan e of s id sp ngmeans and ably connecting the upper ends of the links to the 6 e p se Sacirculation hOlES- rod and a small tubular member passing over 2. A tooljoint cc r ng to claim 1 wherein the rod and when moved downwardlyengaging said operator compr s s a t e loosely telescoped the links formoving the arms inwardly and clear on said rod and surrounding portions01' said th h ld r,

nks. sco'rry ALTON LINNEY.

